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비비례 모델 적용을 통한 곱셈적 사고와 나눗셈 학업성취도 향상 분석
좌승협(Seung-Hyub Jwa),손태권(Tae-Kwon Son),송다솜(Da-Som Song),이광호(Kwang-Ho Lee) 한국교원대학교 뇌기반교육연구소 2020 Brain, Digital, & Learning Vol.10 No.4
The proportional model and the non-proportional model are suggested in the mathematics curriculum as one of the tools to help mathematical understanding, but in Korea, the arithmetic algorithm is only introduced through the proportional model. This study analyzed the degree of multiplication thinking and division academic achievement of 3rd grade students through the application of proportional and non-proportional models. As a result of the study, the experimental group that applied both the proportional model and the non-proportional model significantly improved the multiplicative thinking level and division academic achievement compared to the comparative group. These results indicate that division learning using the proportional model and the proportional model together is more effective. Through these results, we suggested some conclusions and implications for improving division learning and teaching.
양생환경 및 수중펌프압송이 고강도 그라우트의 강도에 미치는 영향
김범휘 ( Kim Beom-hwi ),손다솜 ( Son Da-som ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In recent years, the use of high-strength grout has gained popularity in offshore wind power generation complexes for facility foundations and bridges. These marine wind farms require support for horizontal loads from wind and waves. To ensure the strength of the grout produced in environments similar to the actual placing site, this study investigated the curing of high-strength grout discharged through pump pressure in various environments, and examined the difference in strength according to different variables. Compressive strength measurements revealed that the core specimen collected from the bottom (3cm) and uppermost (50cm) of the specimen exhibited lower strength compared to other height specimens, while the core specimen obtained from the corner exhibited lower strength compared to the center. These findings suggest that the strength difference between the center and the corner is more pronounced when curing at low temperatures. This effect is greater than the strength reduction that typically occurs during low-temperature curing, and thus, necessitates careful attention in similar construction environments.
김해솔 ( Hae Sol Kim ),손다솜 ( Da Som Son ) 이실학회(구 한국경찰이론과실무학회) 2013 경찰연구논집 Vol.11 No.-
우리나라의 지폐는 다공성의 특성과 비다공성의 특성 모두를 갖고 있는 표면 재질로 인하여 잠재지문을 현출하기에 매우 까다로운 물체이다. 또한 지폐는 일반적으로 종이류 잠재지문 현출에 사용되는 DFO, IND (1,8-Diazafluorenone-9-one, 1,2-Indanedione)와 같은 형광성을 가진 아미노산 반응 시약들을 적용하는 것도 지폐 자체가 갖고 있는 형광 물질들 때문에 쉽지 않다. 본 실험은 매우 특별한 성질을 가진 지폐 표면에서 잠재지문을 현출해 내는 가장 적절한 방법을 찾기 위해서 시도 되었고 연구자들은 다양한 종류의 분말들과 Cyanoacrylate fuming(Superglue fuming)법 및 아미노산 반응 시약을 적용해 보았다. 결론적으로, Cyanoacrylate fuming (Superglue fuming)법 이후에 자석분말을 적용하는 것이 가장 좋은 결과 물을 보였으며 BVDA사의 젤라틴 리프터(Gel-lifter)를 사용하여 전사하여 가장 양호한 상태의 지문을 확보할 수 있었다. It is very difficult to detect and develop latent fingerprints on Korea paper money, because Korea paper money has both characteristics of porous surface and non-porous surface. Korea paper money also has fluorescence property that make using some amino acid-sensitive reagents difficult such as 1, 8-Diazafluorenone-9-one, 1, 2-Indanedione and so on. In this experiment, Researchers tried to find the most proper methods to develop latent fingerprints on this unusual surface. We used various powder, Cyanoacrylate fuming (Superglue fuming) method, and amino acid-sensitive reagents. As a result, Cyanoacrylate fuming method followed magnetic powdering is considered as the best method. The fingermarks visualized by Cyanoacrylate fuming method and magnetic powdering were enhanced strongly by transferring to BVDA white gel lifter.
해상환경 및 수중타설이 고강도 그라우트의 역학적 성능에 미치는 영향
김범휘 ( Kim Beom-hwi ),손다솜 ( Son Da-som ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, grout was poured into seawater to confirm the effect of similar marine environment and underwater erosion on the mechanical performance of domestically produced high-performance grout and compared with the existing strength. As a result of the compressive strength measurement, the specimen that simultaneously performed underwater drilling and seawater curing showed slow initial strength expression in both H1 and H2, and from the 7th day, it was confirmed to be within 2% of the existing intensity. It is believed that both grout were caused by disturbance with water during underwater drilling, and the same strength was subsequently shown as the existing strength.
박지윤 ( Park Ji Yoon ),장인동 ( Jang In Dong ),손다솜 ( Son Da Som ),이종구 ( Yi Chong Ku ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Bacteria used in self-healing concrete, which arrest the crack, helps increasing the durability is well known. However, the survival and activity of the bacteria are precisely unknown. In this research, to know the bacteria’s survival curve on the surface of the cement composite, bacteria’s survival curve has been measured by CFU at different curing days. The survival curve of 3 days and 7 days curing does not show the significant differences in their survival tendency. However, the slope of death phase of 7 days curing was steeper than the 3 days of curing. This research was focused on the death phase but for further research, set of interval time will be reduced and observe the lag phase and exponential phase.